二氯甲烷在一些市售 GAC 上的吸附研究：动力学、热力学和竞争离子的影响。
Adsorption studies of Dichloromethane on some commercially available GACs: Effect of kinetics, thermodynamics and competitive ions.
机构信息
Department of Environmental Engineering, Yonsei University, Wonju, Gangwon-do 220-710, South Korea.
出版信息
J Hazard Mater. 2010 Jun 15;178(1-3):963-72. doi: 10.1016/j.jhazmat.2010.02.032. Epub 2010 Feb 17.
The objective of this work was to compare the effectiveness of four commercially available granular activated carbons (GACs); coconut (CGAC), wood (WGAC), lignite (LGAC) and bituminous (BGAC) for the removal of dichloromethane (DCM) from aqueous solution by batch process. Various parameters such as thermodynamics, kinetics, pH, concentration of adsorbate, dosages of adsorbent and competitive ions effect on DCM adsorption were investigated. Maximum adsorption capacity (45.5mg/g for CGAC) was observed at pH 6.0-8.0. The kinetics data indicate better applicability of pseudo-second-order kinetics model at 25 and 35 degrees C. Freundlich model was better obeyed on CGAC, WGAC, and BGAC, while LGAC followed Langmuir model. The adsorption process for 100mg/L initial DCM concentration on CGAC was exothermic in nature. The adsorption of DCM on various adsorbents involves physical adsorption process. The adsorption of DCM over a large range of initial concentration on CGAC and LGAC is effective even in presence of ionic salts.
本工作旨在通过批量实验比较四种市售颗粒活性炭（GAC），即椰子壳（CGAC）、木质（WGAC）、褐煤（LGAC）和烟煤（BGAC）对水溶液中二氯甲烷（DCM）的去除效果。考察了热力学、动力学、pH 值、吸附质浓度、吸附剂用量和竞争离子对 DCM 吸附的影响。在 pH 值为 6.0-8.0 时，观察到最大吸附容量（CGAC 为 45.5mg/g）。动力学数据表明，在 25 和 35°C 下，拟二级动力学模型更适用。在 CGAC、WGAC 和 BGAC 上，Freundlich 模型得到更好的遵循，而 LGAC 则遵循 Langmuir 模型。对于初始 DCM 浓度为 100mg/L 的吸附过程，在 CGAC 上是放热的。DCM 在各种吸附剂上的吸附涉及物理吸附过程。在存在离子盐的情况下，CGAC 和 LGAC 对初始浓度较大范围内的 DCM 吸附也是有效的。
Zotero 插件